U4289BM Datasheet, PDF (1/10 Pages) List of Unclassifed Manufacturers – AM / FM - PLL

Features
• Reference Oscillator up to 15 MHz
• Two Programmable 16-bit Dividers Adjustable from 2 to 65535
• Fine Tuning Steps
– AM ≥ 1 kHz
– FM ≥ 2 kHz
• Loop-push-pull Stage for AM/FM
• High Signal/Noise Ratio
AM/FM PLL
with 1 Switch
Description
The U4289BM is an integrated circuit in BICMOS technology for frequency synthesiz-
ers. It performs all the functions of a PLL radio tuning system and is controlled by a
2-wire bus. The device is designed for all frequency synthesizer applications in radio
receivers, as well as for RDS (Radio Data System) applications.
U4289BM
Figure 1. Block Diagram
OSCIN ¹⁴
OSCOUT
15
SCL ²
SDA ³
AS ⁴
Oscillator
I²C bus
interface
FMOSC ⁶
8
AMOSC
AM/FM
switch
7
GND2
R-divider
Switching
output
Phase
detector
Current
sources
N-divider
1
VDD
16
GND1
5 _SWO1
11 _PDAM
12 _PDAMO
13
VA
9 _PDFMO
10
PDFM
Rev. 4757A–AUDR–10/03